Search found 131 matches

by BillTodd
Wed Apr 16, 2008 12:01 pm
Forum: The Silent Front
Topic: Fanles VIA C3 Nehemiah 1200Mhz machine done!
Replies: 30
Views: 29639

Please, please, cover those holes in your PSU with finger proof mesh (specially the ones that expose the high voltage pcb tracks). You really don't to give yourself/son/daughter/nephew/niece/neighbour a shock with 400vdc.

Otherwise; Nice job :)
by BillTodd
Sun Mar 30, 2008 6:08 pm
Forum: The Silent Front
Topic: Cheap, readily available sound meter for SPCR forum members?
Replies: 54
Views: 43520

your ambient is 30 dBA you shouldn't be able to hear your hard drive right? wrong, with the pc running (with two 10,000 rpm raptors - on the floor beside me) the ambient level increases by about 2dB to ~32dBA, the whining of the Hdd/fans are plainly audble . As I've said before on this forum, ambie...
by BillTodd
Sun Mar 30, 2008 12:21 pm
Forum: The Silent Front
Topic: Cheap, readily available sound meter for SPCR forum members?
Replies: 54
Views: 43520

But you can definitely get something that will read under 20 dba if you try hard enough and have plenty of cash It's really down to the microphone used; Cheap sound level meters tend to use simple electret microphone capsules which, while adequate for normal levels, are too intrinsically noisy for ...
by BillTodd
Thu Mar 27, 2008 12:50 pm
Forum: General Gallery
Topic: Exclusive low-end office PC - wood + steel.
Replies: 50
Views: 23050

Simply: Mobo is grounded by wires to ground connections of PSU. If you intend to sell these, you will have to do more than this to meet European CE specifications, Ishi. Under the CE legislation you are held personally responsible for meeting the specs of anything you sell ( I know I've been there ...
by BillTodd
Tue Mar 25, 2008 9:48 am
Forum: SPCR Article Discussion
Topic: PC Hi-Fi: Scythe's Kama Bay Amp
Replies: 29
Views: 16071

Have a look at these Hypex modules ( http://www.hypex.nl/ ) Great link, they look like great products.... Not sure I should thank you tho: I'm beginning to feel the need to build a multichannel amp... :roll: I've used them in a couple of pro-audio projects (and have a couple of others in the pipeli...
by BillTodd
Tue Mar 25, 2008 6:36 am
Forum: SPCR Article Discussion
Topic: PC Hi-Fi: Scythe's Kama Bay Amp
Replies: 29
Views: 16071

t might be worth buying just to drive the neighbors crazy when their phone drops out... I apologize for not doing any research, but aren't there laws against products that cause RF interference? Older switch mode amps were notorious for interference and poor distortion etc. but, thanks to much high...
by BillTodd
Mon Mar 24, 2008 2:20 pm
Forum: General Gallery
Topic: Dual MB..... Rocketfish/Lian Li. Now in wood.
Replies: 34
Views: 19170

Why two machines in the same box? (just curious)
by BillTodd
Sun Mar 23, 2008 12:45 pm
Forum: The Silent Front
Topic: Solid State Fan, Ionic Cooling Hits The Big Time!
Replies: 24
Views: 10771

NeilBlanchard wrote:Hi,

I'm curious: which direction does the air flow?
same direction as the electrons; from the thin wire to the blunt heat-sink
by BillTodd
Thu Mar 20, 2008 8:01 am
Forum: The Silent Front
Topic: Solid State Fan, Ionic Cooling Hits The Big Time!
Replies: 24
Views: 10771

What a homebrew one might look like: :wink:

Image
by BillTodd
Thu Mar 20, 2008 6:42 am
Forum: The Silent Front
Topic: Solid State Fan, Ionic Cooling Hits The Big Time!
Replies: 24
Views: 10771

NeilBlanchard wrote:Hello,

My first question about this technology is does it produce ozone?
Probably not, certainly no more than a laser printer, photocopier, CRT, microwave oven etc.
by BillTodd
Thu Mar 20, 2008 6:39 am
Forum: The Silent Front
Topic: Solid State Fan, Ionic Cooling Hits The Big Time!
Replies: 24
Views: 10771

the electrodes are specially shaped to concentrate the electric field. I expect the voltage is not actually that high. Yes. The device shown is 15 x 15mm, each 'gully' is ~3mm across, so air gap to electrode is ~1.5mm. Air breaks down at about 1100V/mm (if memory serves) so maximum voltage would be...
by BillTodd
Thu Mar 20, 2008 5:52 am
Forum: The Silent Front
Topic: Solid State Fan, Ionic Cooling Hits The Big Time!
Replies: 24
Views: 10771

Better picture of the thing here:

http://www.thorrn.com/technology.html

The curved and vented (aluminium?) part becomes the heat-sink when integrated onto a chip. There are (not visible in the picture) ultra fine wire electrodes that stretch down the length of each vented gully.
by BillTodd
Mon Mar 17, 2008 3:01 pm
Forum: General Gallery
Topic: Zalman TNN 500 AF based workstation (Q6600/NV6200LE/2 disks)
Replies: 9
Views: 8236

is it worth it?.
Who knows?

But, it IS the way all PC's should be made :)
by BillTodd
Mon Mar 17, 2008 2:11 pm
Forum: General Gallery
Topic: Zalman TNN 500 AF based workstation (Q6600/NV6200LE/2 disks)
Replies: 9
Views: 8236

I'm also maximally surprised by the fact that temperatures of independent cores are lower than Tcase. I think this is not possible, but cannot decide what's going wrong here. Any idea? Assuming the monitors are calibrated correctly (i.e. they are reading the correct temperature) then the only reaso...
by BillTodd
Wed Mar 12, 2008 7:08 am
Forum: The Silent Front
Topic: "Green" computing saves energy?
Replies: 11
Views: 4157

your home furnace which is probably only 10-20% The SEDBUK figures (http://www.sedbuk.com/) suggest somewhat better than this. (e.g. My Vaillant condensing boiler is rated at 91%) Baring in mind a large proportion of the UK's electricity is generated from gas, electric heating has to be less effici...
by BillTodd
Wed Mar 12, 2008 4:27 am
Forum: Silent Storage
Topic: New 5.25 bay HDD Box project - alleycat/sandwiching/copper??
Replies: 11
Views: 3039

How thin can coldpacks be and still be effective? In terms of cooling, the thinner the better (they have poor thermal conductivity, so the less distance the heat travels the better) Would this be enough to sufficiently dampen vibrations? While the gel does help to dampen vibration (they are fairly ...
by BillTodd
Tue Mar 11, 2008 2:11 pm
Forum: Silent Storage
Topic: New 5.25 bay HDD Box project - alleycat/sandwiching/copper??
Replies: 11
Views: 3039

If the main purpose of having the box airtight is to keep sound waves in the air from coming out, then the main reason thicker aluminum would help is because it has more mass. By George! he's got it :lol: Why not get a heavy material... like steel, lead, lead is dense but poor thermally (worse than...
by BillTodd
Tue Mar 11, 2008 4:57 am
Forum: Silent Storage
Topic: New 5.25 bay HDD Box project - alleycat/sandwiching/copper??
Replies: 11
Views: 3039

This noise has nothing to do with vibrations. :roll: :roll: Where do I start??? Sound is just vibration of the air, if it's fast enough we hear it as sound, if it's too fast we don't. You'll probably be surprised to know that, because the HDD is itself a closed box, ALL the sound you hear from the ...
by BillTodd
Mon Mar 10, 2008 5:54 pm
Forum: Silent Storage
Topic: New 5.25 bay HDD Box project - alleycat/sandwiching/copper??
Replies: 11
Views: 3039

If the drive touches the box, it might as well not be in a box. The whole idea is the suspend the drive in the box, so the drives sound (air vibrations) & mechanical vibrations don't make it to the outside world. The gel-pack mearly helps to reduce the temperature by filling the gap between box and ...
by BillTodd
Mon Mar 10, 2008 12:32 pm
Forum: Silent Storage
Topic: New 5.25 bay HDD Box project - alleycat/sandwiching/copper??
Replies: 11
Views: 3039

Cu v. Al - As previously stated, thermodymanically there'll be little difference in this application (the principle thermal resistance is the gel pack). Copper has the advantage of greater density (the greater mass will help to reduce vibrations) and it would be easy to solder the joints (if that's ...
by BillTodd
Mon Mar 10, 2008 7:43 am
Forum: SPCR Article Discussion
Topic: Ninja Copper: Scythe's 5th Year Celebration
Replies: 84
Views: 43958

Mike,

Have you concidered measuring the thermal resistance of these and other suitable heat-sinks (in free and forced air)?

[I've been searching the web to find free-air ratings for the Scythe and other heat-sinks and have found nothing so far]
by BillTodd
Sat Mar 08, 2008 6:51 am
Forum: SPCR Article Discussion
Topic: Antec Mini P180: A micro-ATX P182
Replies: 74
Views: 75174

I would have loved to have read the measurements and subjective conclusions on the top 200mm hooked up to a viable resistor and set to its lowest start-up voltage. Though I realise this can vary from fan to fan. If you put a capacitor (220-1000uF) in parallel with the resistor, it'll provide the en...
by BillTodd
Fri Mar 07, 2008 6:31 am
Forum: The Silent Front
Topic: Is a fanless PC possible?
Replies: 36
Views: 24725

I've sent MikeC more pictures and info, there should be an update on the spcr site soon :)
by BillTodd
Wed Mar 05, 2008 3:35 pm
Forum: The Silent Front
Topic: Is a fanless PC possible?
Replies: 36
Views: 24725

A fanless 2.53GHz P4 is possible: I've just about completed the upgrade to my SilentPC project. CPU temperature stays below 60'C ( <+30'C) at full load. Even running continuous bench-marks for an hour failed to raise the CPU above 50'C in my, rather cold, workshop. http://homepage.ntlworld.com/bill_...
by BillTodd
Wed Mar 05, 2008 3:24 pm
Forum: SPCR Article Discussion
Topic: Bill's Recycled, Fanless, Silent Woodbox P3
Replies: 25
Views: 26045

P3 becomes a P4

Hi All, Just thought you like to know I've just about completed an update to the Old SilentPC. I've changed the motherboard, CPU and power supply, HDD and heat-sinks The machine is now a 2.53GHz Pentium4 (SL682) running in a Gigabyte GA8-SIML motherboard with 512MB ram and a 80GB Segate drive. The h...
by BillTodd
Tue Mar 04, 2008 3:24 pm
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

Opteron 170 @ 2,4 GHz (TDP 89 W)
:shock: I've been struggling* with a 59.3w P4, 89 watt - no wonder he was having problems :lol:


(* I think I've cracked it - 44'C [+22'C] ATM @ full power on the test bench 8) )
by BillTodd
Tue Mar 04, 2008 7:20 am
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

Does the length of the heatpipe drastically affect the thermal resistance? The thermal resistance is caused by the internal wick construction: i.e. high to low: Mesh, Sintered, Grooved. Think about the path that the heat takes from surface of the pipe to the working fluid. Grooved walls are going t...
by BillTodd
Sat Mar 01, 2008 6:47 pm
Forum: The Silent Front
Topic: how to monitor temperatures
Replies: 3
Views: 2064

i want to run my PSU fanless, and i want to monitor my PSU's temps to see how big of a radiator i will have to add. The temperature will not tell you that. You will need to work out how much power the psu is dissipating as heat. To do that, you must measure how much power is going in (as AC) and ho...
by BillTodd
Fri Feb 29, 2008 5:56 am
Forum: The Silent Front
Topic: The theory behind fanless systems?
Replies: 41
Views: 16745

A nice silent option to look into is an ionic fan which can be found here ( http://www.inventgeek.com/Projects/IonCooler2/Page1.aspx ). This article has been mentioned here before. I tried to make my own but it did not succeed, i will retry my build once i have the time. What a good idea! I'd compl...
by BillTodd
Fri Feb 29, 2008 5:31 am
Forum: The Silent Front
Topic: Graphene has >10x better conductivity than copper
Replies: 12
Views: 4903

Thermal conductivity of magnesium is 150 W/(m.K) Ally ~200 Copper 385 Diamond 900 The measurements of Graphene are of molecular thickness membranes (they would make interesting, and lethally sharp, heat-sink fins :)) I wonder though, if these membranes were layered whether they would retain their hu...